offering what little I know
As far as the mirror being in the up position it may just be a matter of some basic cleaning depending on what conditions he kept it stored under...
just from my "fun" experiences with my K1000...I don't know anything about the one your talking about but it seems similar in issues. here's my half a penny
P.S. when you say the film advance do you mean the counter or the actual piece that advances...because every so often mine(advance handle) gets "stuck" to the right and it takes fiddling with the handle and with the shutter buttton to get it to click in place and it works fine again and the counter hasn't worked for abou three years and I just keep track of the shots